Method of manufacture of blade disks for radial admission turbines



Nov. 22, 1932. w. KASTERT 1,888,508

METHOD OF MANUFACTURE OF BLADE DISKS FOR RADIAL ADMISSION TURBINES .Filed Jan. 17, 1930 Patented Nov. 22, 1932 wI'LHELi/r KA'srnR'r; or mornnnw-nonng GERMAN-Y;- nssronora TO 5 SIEMENS-sonnet KERTWERKE AKTIENGESE-LLSCHAFTj'QF PORATION or" GERMANY nnrmm-smmnnssmnry GERMANY: moons;

\ METHODOF MANUFACTURE-0F BLADE Drsxs FoR RADIAL-ADMISsIOitTUBBINESQ Application filedJ'anuary 173 1930, seria no.

invention relates to improvements in' the method "of manufacture offblade assem blies for radialadmission turbines. v

invention consistssubstantially,in providing flat bars or strips with slots along one edge of each, in inserting the opposite ends of individual blades into these slots with said bars or strips arranged'inaa commonplane and with the widths of said blades arranged transversely with respect to said common plane. Said blades are then Inetallically joined to the side bars or strips after which theblading section thus constructed is subjectedto a machining operation followed by an arcuate bending operation to prepare them for being parallelly' mounted in the axially" presented flanges of the rotor or stator'mem ber. ofthe turbine with Which' they are rigidly united; i p a Anembodiment ofmy invention is'shown onfthe annexed drawing in which Figure l'isa radial'sectionjof the stator body of a radial admission turbine provided with a bladi'ng assembly constructed accord ing to the presentimproved method.

Figure 2 isa corresponding radialsection ofa'rotor disk provided with a blading as sembly constructed according to the present invention and coaxially arranged with" the stator body in readiness to be moved" axially into inter-operative position with" respect to said stator body. l

Figure 3 is a fragmentary radial section? of the rotor disk, having a finished blading section mounted between the'axially-spaced carrier and bearing rings for one of'fthe circular blade assemblies.

Figure i is a plan view of one of th'e'partlyfinished blading sections prior to the machine finishing and cylindrical bending'operations which precede the mounting of said section in the rotor disk. I

Figure 5 is anedgewise view ofF-igure 4,

Figure 6 is a plan view of a blank or blade section cutfrom a rod or sto'ck-piecehavi'ng the desired cross-sectionof the finished blade.

7 Figure-'7 is'an end view oftlie'saine.

Fi 1re8 is a iragmentary to'p'. p'l'anview. ofa ished bl'ade'segmentprior toxinsertion 7 in therotor or'stator;

421,438, main Germany-January: 18; 1929.

Figure 9 'is" afragmentarysection'fof tlfe same onthe'line 9 9of Figure' 8. p 7

1h the embodimentpf *m' inventionshown on the "drawing, bl'a'ding sections of m'y'imf proved construction are mounted to"project* prior toz'their' placement into interoperative position; Eorthis urpose; I' mayempi y a stator body 1 provided with a central inlet opening 2 for thiadniission of-steam around the end" of rotor shaft 3 upon'which the hub portion 4 of a rotor disk"5 is supported;

The stator body 1 is provided Witlfan'n'ular v recesses 6' whi'chflarearrangedf in'"groups which decrease depth toward the; axis of the stator? Theannularreces'se's "GiforI'N'a' p ltlralityofconcentrically.arranged bearing;

ledges Twhi'ch carry "circular-ren ed stator blads 8'; each circular 'series" of said. stator blades'" being 1 arranged intermediate-l5? with respect'to' one of the bearing ledges? and a circular bearing ring -9 which is: axially dis= placed with respect to saidbearingiledge: The rotor disk '5 is providedw'itli a series of annulanre'cesses' 10 sforrning bearing ledges 11 from-which the; rotor blades 112flproject" axially in circumferential series; the rotor blades 12ineach* circular series being con nected together-at their outer ends "by a; cir cular bearing ring 18. i After the stator and rotor lfa've been construoted i'n "the Irrannerto be hereinafter'pointed out, the rotor is' mov'ed axially into cooperative relation with-1 the stator body, with the protruding bearing rings13 on the outerendsiofthe rotor'blades 12 in rotary sliding contact Witlr the cor responding bO'dYdg p v v x The manufao-tureof the -blades according to my invention takesplace in the fol'lowing bearing ledges 7 of" the stator manner. Fromastocld'piece' orbar"whi'ch hasbeen drawn-with the desired cross section slrown Figure 7, arecut'fblade's 8* or12 of the 1 required 5 length. Suitable side 'ba-rs or strips 14 and 15 whiclihave beeii cut fr'om flat sto'ckin lengths equal-'- to 'the' rectified" arc f the desired arcuate bladinjg section=,' '-are provided 'witli slots" or notchesf 1 0 along-one edge o'f each for receiving tlie oppesite ends of the "blades" 8' or m -With thir broadsun c as rolling. V

My improved'method of manufacture is faces or widths arranged transversely to the edges of said side bars or strips. Said blades are then metalically joined to the side bars by welding or soldering at one or both ends to form a kind of lattice work or grid as shown in Figures 4 and 5. This grid or partly-finished blading section is then subjecteditoa suitable process, such as milling,

to impart the desired size and finish thereto and for removing the material enclosed by dottedlines in Figure 3. The blading section is thenbent into an arc to conform to the curvature of the ledge or carrier flange which projects axially from the rotor or stator member of the turbine as the case may be. The completed blading section is now ready for installation on the carrier and may be rigidly united thereto by a suitable operation such characterized by great simplicity and economy connected with the assembly of the parts constructed from previously shaped stock and the machining operations performed on an, entire blading section instead of on its constituent parts.

l. The process of producing sections of a blades'for radial flow turbines, which process consists in arranging the individual vblades in parallelism with each other and extending between the spaced adjacent edges of two pararranged flat sidebars, in uniting the ends of arcuate cylindrical form.

v allelly arranged flat side bars, in joining the opposite ends of said blades to saidside bars respectively, and finally in bending the flat blading section thus produce-d into an arcuate cylindrical form. I

v 2. The'process of producing sections of blades for radial flow turbines, which proc-' ess consists in arranging the individual blades in parallelism with each other and with their opposite ends crosswise with respect to the adjacent edges of two parallelly the flat bladingsection thus produced, and

finally in bending said flat section into an 4."The method of making arcuate cylin drical sections of blading for radial flow turbines, said method consisting in arranging a, pair of flat strips with theirlateraledges parallel, in cutting blade sections of substantially uniform length from a bar having the standard cross-section of the finished blades, in arranging said blades in parallelism with each other between the edges of said flat strips with the widths of said blade sections inclined to the common plane of said flat strips, in joining the opposite ends of each blade to the adjacent edges of said fiat strips, and in bending the flat-strips into cy- -V lindrical arcuate form adapted to be concentrically mounted with respect. to the rotary axis of said turbine.

5. The method of making. arcuateicylin- I drical sections of blading for radial flow turbines, said method consisting in constructing a pair of fiat side strips, in cutting uniformly spaced'slots in one edge of each of said. side strips, in arranging said side strips parallel to each other with their slottedvedges presented towards each other, in inserting the opposite ends of. a plurality. of parallellyarranged blades in the slots in the. adj acent' edges of said side strips, said blades being arranged to project edgewise on opposite sides of the lateral strips, insecuring the opposite ends of said blades to the side strips, and in bending the blading section thus produced into an arcuate cylindrical form.

6. The method of making arcuate cylins drical sections of lblading for radial'flow turbines, said method consisting in construct;-

ing a pairofside stripsof' equal lengthfin V cutting uniformlyspaced slots. in onefedge of each of said side strips, in arrangingsaid side strips parallel to each other with their slotted edges adjacent to each other, in cutting sections of substantially uniform length from a bar provided with the standard cross-sec-v tion of the finished blades, in inserting the opposite'ends of each blade into the slots of said side strips, in uniting the ends of said blades to the side strips, and in bending the blading section thusproduced into a cylinf drical arc. v r V '7. The method of making arcuate cylindrical sections of blading 'for radial flow turbines, said method consisting in providing one edge of each of a pair of side strips with uniformly spaced slots, in arranging said side strips with-their slotted edges parallel and adjacent, in inserting the oppositeends of a plurality of blades into the slots in said side strips, saidblades being arranged transverse ly to the thickness of metal in said side strips,

lie

in Weldingsaid blades to-one of saidv side strips, in machining the partially-completed blading thus produced to the desired finished form, and in bending thevblading section into a cylindrical arc corresponding to'the curvature of the mounted. j .c 8; The method of making arcuate cylindrical sections of blading for 'radial'flowturbines, said method consisting in construct-c ing a pair of side'st'rips of equal length, in

cutting uniformly spaced slots in "oneedge carrier in which it is to be of each of said side strips, said slots having a Width approximately equal to the greatest thickness of the blades, in arranging said side strips with their slotted edges parallel and adjacent, in cutting sections of substantially uniform length from a bar of standard crosssection to form the blades, in inserting the opposite ends of said blades into the slots of said side strips with their Widths arranged transversely to the thickness of metal composing said side strips, in Welding said blades to the side strips, in milling off the opposite ends of the blades to the finished length,

in bending the blading section into an arouate cylindrical section, in inserting the lateral strips and milled portions of the blades into axially spaced slotted carrier flanges of a turbine member, and in deforming the metal in said slotted carrier flanges to positively clamp the arouate segments in position in the carrier.

In testimony whereof I affix my signature.

WILHELM KASTERT. 

